The after cats are to make sure the cats are doing their job the before cats are to get your afr closer to stoich.
The after cats are to make sure the cats are doing their job the before cats are to get your afr closer to stoich.
ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06
waiting to go in... 3.90s, 214/220cam
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